Police said the man, possibly Hispanic and in his mid- to late-20s, was in a silver or gray sedan when he exposed himself to the three girls near Ward Park in Brookline Village around 4:30 p.m.

Witnesses are being interviewed and police said they are searching for video footage to identify a possible suspect.

During the investigation, police said they learned that a similar incident occurred near Brookline High School on Sept. 28 around 4:20 p.m. In that incident, police said, a man exposed himself to three middle school-age students on Greenough Street.

Police said they're working to determine if the incidents are connected.

The public is being asked to be aware of their surroundings, especially with Halloween on Monday.